Ships from abroad oddly carrying bananas (6)
I believe the answer is:
armada
'ships' is the definition.
(group of ships)
'abroad oddly carrying bananas' is the wordplay.
'oddly' means one should take alternating letters (letters in odd-numbered positions).
'carrying' means one lot of letters goes inside another.
'bananas' becomes 'mad' (slang for insane).
The alternating letters of 'abroad' are 'ara'.
'ara' going around 'mad' is 'ARMADA'.
'from' is the link.
(Other definitions for armada that I've seen before include "Naval fighting force" , "sea-borne unit" , "Many ships" , "force of the sea" , "Large flotilla" .)